Mego
proposed Wonder woman outfits on many occasions but it was
thought they weren't released. Below is the 1978 catalog offerings..

Later
it was discovered that Parkdale Novelty of Canada had released
separate outfits, see the pics below..

Notice
that Diana Prince was now marketed as a separate outfit.

Black Belt is an odd name considering the outfits obvious
red belt

Here
is a Canadian Carded Mego Wonder Woman "Lipstick" outfit,
courtesy of Jim.

Here
is a Canadian Carded Mego Wonder Woman "Grecian" outfit, courtesy
of Jim.

Yet
another carded Wonder Woman Outfit has surfaced, courtesy
of Jim the creator of this gallery. Jim mentions that this
came from a collection in Canada and he can only assume that
Mego produced (for Parkdale Novelty) the entire outfit lines
shown in the 1977 and 1978 Toy Fair catalogs for a VERY brief
period. Parkdale likely ordered the outfits that American
buyers passed on, so a limited quantity was produced for the
Canadian market.

These
carded outfits are the only two known currently and are considered
extremely rare..